Chuck



Aug. 4, 1931. J. J. N. VAN HAMERSVELD 1,817,721 CHUCK Filed April 9,1928 3 Sheets-Sheet 2 gew/0 @I @Skov/v2.14 S

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Allg' 4,1931- J. J. N. VAN HAMERsvELD 1,817,721

l CHUCK Filed April 9., 1928 3 Sheets-,Sheet 5 JOHN JQN', VAN

- .2 terweight .fifi

Patented Aug. 4, 1931 y UNiTED STATES PATENT oFFlcr;

HAMERSVELD, onctnvnnaun mateurs, OHIO, Assieujon To THE WARNER & SWASEYCOMPANY, OF" CLEVELAND, OHIO, A CORPORATION 0F OHIO CHUCK i iApplcation'led April 9, 1928.v Serial 110.2681392.

This invention relates to chucks adapted to receive workpieces havinglaterally offset, concentric portions to be machined and thereforerequiring the use of ay slide or equivalent device by whichV the chuckbody and work may be moved laterally to bring' different portions oftheworkpiece into line with the aXis of the machine.

,The principal object lof this invention is to provide an improved chuckof this nature.

A further object is to provide in the structure a counterweight sodisposed with reference to the chuck body and to an actuating memberthat both the chuck body and counare shifted laterally by the actu atingmember so that the offset weight ofthe chuck body and of the work piece`will at all times be properly counterbalanced. A

A still further object is to provide in the structure a lock bolt orequivalent rvdevice for accurately positioning the chuck body in any oneof a number of different Apositions-predetermined with respect to akgiven work piece, this locking devicebeing sodisposed that it can bewithdrawn and also permitted to reinsert itself into 'locking engagementwith the chuck body'` by the manipulation of the same part whichcontrolsthe chuck' body .and counterweight. In other words, it is one of theobjects to construct the chuck, in-

cludi'ngy the chuck body and associated Vparts' so that by themanipulation of one member through the instrumentality ofv a wrenchorequivalent shifting device all three of *the parts mentioned, namely,the Ilockingy device, the chuck bodyand the counterweights, Vwill bemanipulated-`f I@ A still further object is to Aprovide means wherebynot only can thecounterweight be shifted to compensate forV the lateralmovement of the chuck but-"maybe actuated to vary its counte'rweightingveffectiveness to adapt `it for work pieces of different weights,irrespective of the direction or amount that the ychuck body ismovedlaterally with refcrence to the center of rotation.

A still further object is to provide means whereby the counterweight maybe actuated to vary its effectiveness'to adapt it'for work pieces ofsubstantially the same `we1ghts ,but

where-inthe weight ofthe work piece is unsymmetrically disposed withreference to its center.

The abovev and other objects are attained by `thejpresent inventionwhich may be here briefly summarized as yconsistingin certain Vnovelcombinations and. arrangements o f parts and details of constructionwhich'will be described in the specification and set forth in theappended claims.`

wherein I have shown onev embodiment of the invention, Fig. 1 is avertical sectional view substantiallyv along the irregular line 1-1 ofFig. 3, the work piece being removed; Fig. 2 is a sectionv takensubstantially along the line 2 2 of Fig. 1, a portion of the chuck beingbroken away; Fig. 3 is a front end View of the chuck with a portion insection, showing the chuck bodyv displaced with its axis4 laterally ofthe axis of rotation so that a portion of the work piece offset from thecenter of the chuck bodymay be machined; Fig. 4 is a fragmentarysectional View substantially along the line 4-4 of Fig. 1; Fig. 5 is aView similar to Fig. 2 but showing a modiiication; i and Fig. 6 is asectional view substantially along the line 6-6 of Fig, 5. l

Referring now to the drawings, it will be noted-that the chuck as awhole includes a part whichis adapted to be securedto a rotatingspindle, which part may be termed an adapter, and a laterally movablepart ca'r Vried thereby, this latter part beingad-apted to support'theworkpiece and being generally termed the iencey of assembly, the adapter10 is preferably composed of two main'parts 11 and 1Q,

which are annular members, one centralized p on the other and adapted tobe rigidly sercured togetherby screws 13. The inner annular member 11hasa threaded boss 14: which may be screwed onto the spindle 4of latheor othermachine tool, The front mem-v ber 1.2 'of the adapter has on itsfront face a., duide 15 which in this instance is undercut or 1n theform of a dovetailwhich extends laterally of the axis of the adapter.`The guide 15 is adapted to slidingly. receive the 4chuck body 16, whichwill kbe suitably con- Y In the accompanying sheetsof drawingsV .g5chuck body. .For convenl structed to irmly support the work piece. Inthis instance, the chuck body 16 has a flanged rear wall 17 providedwith a. dovetailed groove to receive the guide 15, the body being inthis instance somewhat ovalshaped.

Though the invention is not limited to a chuck for machining anyparticular type or form of work piece, the chuck herein illustrated isespecially adapted for use in machining multiple bottle molds having abody which is to be machined on what may Ybe termed the center of themold and two or more individual mold portions laterally olfset withrespect to each other and to the center of the mold. In this instancethemultiple bottle mold is designated as a whole by the reference character18, this mold being formedv in two halves joined by" a hinge pin 19 andhaving annular portions 18a which are adapted to be turned and faced tofit a companion part of the mold not here illustrated and two individualmold portions 185 and 180 which, as illustrated in Fig. 3, are offsetwith respect to each other and with respect tothe aXis of the annularportion 18a, these two portions being adapted to be bored to suit thecontour of the bottles to be molded. Vhile the above features of themold are pointed out they do not form a part of the invention proper.

The work piece is adapted in this instance to be supported in th-e chuckbody on two longitudinally extending rails 20 and 21 which arediametrically opposite each other and by means of a plurality ofradially disposed set-screws 22 which are adapted to engage lugs orother appropriate parts formed on the two halves of the mold. The chuckbody is given an oval shape to provide thickened portions to accommodateand iirmly support the rails 2O and 21, these being held in position bysuitable set-screws indicated at 23. These rails 2O and 21 are ofsuitable length and may be adjusted lengthwise if desired and they maybe replaced with others to accommodate work pieces of varying shapes andlengths.

I have provided in my improved chuck means for conveniently shifting thechuck body on the guide 15. This is preferably accomplished by means ofan actuating member 24 which extends radially and centrally through thefront member 12 of the adapter Vat right angles to the center ofrotation.

This actuating member is in the form of a rod which is adapted to beturned and also to be moved endwise for reasons to be explained. At itsouter end it is provided with a wrench portion 24a so that a wrench canbe readily applied to it to turn it and more it in an endwise direction.This rod is provided near its center, as clearly shown in Fig. 1, with along faced pinion 25 which engages a rack 26 secured by set-screws 27 orequivalent means on the rear face of the back wall 17 of the chuck body,the guide 15 having a slot 28 cut therein to receive the rack 26, whichslot is of such length as not to interfere with the maximum intendedlateral movement of the chuck body (note Fig. 2).

The actuating member 24: performs other functions in the respect that itis adapted to shift a locking device which accurately centers the slidein predetermined positions and also shifts a counterweight which isadapted to counterbalance the off-center weight of the chuck body and ofthe work piece. This last mentioned feature will next be described.

The ccunterweight which is designated as a whole by the referencecharacter 29 is in the construction illustrated in Figs. 1 to 4 composedof two halvesp29a and 295 which are normally held in fixed relation andare shifted as a unit simultaneously with the shifting of the chuck bodybut in the opposite direction to that in which the chuck body isshifted. The counterweight 29 is carried by the adapter and its twohalves 29a and 29?) are adapted to be shifted either as a unit when thechuck body is adjusted or relative to each other, for a purpose to beexplained, in a recessed portion 30 formed on the rear side of the frontmember 12 of the adapter, this recessed portion forming a guideway forthe movement of the counterweight as a whole or for the relativemovement of its two halves. Two opposite sides of the recessed portion30 are formed by a pair of parallel guide ribs 30a both shown in Fig. 4and one shown in full lines and the other by dotted lines in Fig. 1. l

The two halves of the counterweight are normally held in fixed relationby a connecting member 31 having right and left hand threaded portionswhich the two halves .of the counter-weight engage, as clearly shown inFig. 2. Carried by this member in recessed portions of the two halves ofthe counterweight is a rack 32 which is held between a fixed shoulder 33and a collar 34 on the member 31.

This rack is just rearwardly of the front rack 26 carried by the chuckbody and it engages the long faced pinion 15 of the actuating memberlY2li, but on the opposite side of Athe latter with respect to the firstmentioned rack 26 so that when the actuating member 24 and the longfaced pinion 25 are turned these two racks will move in oppositedirections, causing the counterweight and slide to move in oppositedirections laterally with respect to the aXis of the chuck.

Ordinarily the member 3l is not turned -when a series of similar workpieces are being machined in the chuck, but when a work piece having adifferent weight is to be received in the chuck, it becomes necessary tovary the effectiveness of the counterwei-ght,

and this is done by moving the two halves of the counterweight inwardlyVtoward or outwardly away from each other so as to decrease or increase,as the case may be, the counterbalancing effect of the counterweight;Thatis to say, the relative positions of the two counterweights will beadjustedto suit a particular work piece, and when once they A have beenadjusted to their correct relative through openings opposite eachpositions or spacing they are thereafter shifted as a unit when thechuck body is shifted. To admit of `the counterweight halves beingrelatively moved byturning the member 31, the opposite ends of thismember are provided with wrench portions 31a which are preferably ofthesame size and similar' in sha e to the wrench portion 24a of theact-uator 24 so that the same wrench can be em-V ployed to turn themember 31-as is used to turn the actuator 24. The member 31 extendsthrough the adapter at right angles to and rearwardly of the actuator 24and access may be had to the opposite ends of the member 31 35 formeddiametrically other in the peripheral wall of the front member 12 of theadapter,'as clearly shown in Fig. 2.

It might be noted, before passing to the description of the other partsof the chuck, that the counterweight 29 is completely housed in what maybe termed a Acompartment of the adapter, the walls of the compartmentbeing amply heavy to avoid breakage and injur'yinthe event thatcentrifugal force acting on the counterweight should be Treat enough tothrow it outwardly beyond the position that it is intended to occupy.V

In other words, there is an ample factor of safety in the event ofbreakage of any of A the parts which hold the counterweight in anyposition towhich it has been adjusted.

Thus it will be seen that by turningthe actuator 24 to position anyofthe portions 18?) or 180 of the work piece centrally with respect tochuck body and multaneously until the-'chuck moved to the desiredposition.

counter-weight are shifted si- Then the chuck body'is clamped inthatposition by means of a set of clampingbolts 36, one being shown inFig. 1 and the entire lset in' Fig. 3. These clamping bolts extendthroughY the ianged rear portion of the chuck body into T-slots formedvin the front member 12 of the adapter.` They must', of course, beloos`v cned before the chuck body canbe shifted, and'after the chuckbody has been moved to the desired position, they will be tightened soasl to firmly secure the chuck body to the adapter.

It is desirable that the chuck body be very accurately positionedinkorder that the different parts of the work piece which `are to bemachined will in thefinis'hed mold have f l c operation: l/Vhen'it isdesired to shift the the exact relative positions.` Accordingl I theaXisof rotation both the body'has beenV or accurately position it when ithas been moved to substantially its correctposition.`

' Thisv locking device'is preferably in the l.

form of a lock bolt 37 which, as clearly shown in Figs. land 3', iscarried by the front portion of the adapter opposite the chuck body, andhas a'tapered inner end which is adapted to engage in any one of aseries of correctly positioned sockets 38formed in the rear portion vofthe chuck body.` This series of sockets 38 lie in aline which isparallel 'with'the movement of the chuck body on the adapter so that theinner end ofthe lock bolt will be enabled to engage in the appropriatesocket of the series. Witha work piece which is to be provided with orlocation-of the portionsto be thus ma-V chined varies with differentwork pieces, the proper number and location of sockets 38 will-beprovided. Inrthis instance I show these sockets formed in a removablepiece 39 which is attached to a straight portion at the rear part of thechuck body. f f

As a fur-therfeature Yof this part of my invention," I -provide meanswhereby this lock boltis shifted rby the movement of the actuatoru24,and in order that this may be .done the Vactuator is designed tobe-given an endwiseV movement as well `as a rotary movement, Vthe-endwise movement withdrawing the lock bolt from the chuck body. Toaccomplish this, the vlock bolt is arranged directly in front of theactuator adjacent one end thereof and it is adapted to be shifted byal'ever 40 which is arranged in linewith the actuator 24 and is normally4engaged by the end-thereof.

@ne end of this' lever engages the'lock bolt and the otherend is engagedby a vspring actuated plunger 41 which restores thelock bolt `to'lockingengagement-with the chuck body and maintains aconstant pressure on thelock bolt-to normally keep it in locking position.'l The, springis alsodesigned to move the actuator24 back to its-normal position. Itwill benoted that the leveris situ- 'three machined portions I -such as hereindescribed, there will be three 851 vopposite sides of the recess in themanner indicated in Fig. 4. y l

` The following is a brief description of the CII Cil

chuck body, the clamping bolts 36 are loosened. Then the operatorapplies a wrench to the portion 24a of the actuator 24 and pushes theactuator inwardly so as to move it in an endwise direction and therebywithdraw the lock bolt from the socket of the chuck body. He will thenturn the wrench so as to turn the actuator, and as soon as he has veryslightly turned the actuator' the endwise pressure can be released sothat the inner end of the lock bolt will bear against the chuck body orstrip 39 in case the latter is employed, and therefore be in position tosnap into the next socket 3,8 as soon as the chuck body, by furtherrotation of the actuating member, has been moved far enough to enablethis to occur. The chuck is now positioned to ypermit one of thedesignated portions of the work piece to be machined. As soon as thechuck is in this position the clamping bolts 36 are tightened, whereuponthe chuck as a whole can be rotated and the necessary machine work done.The pinion 25 is long enough so that when the actuator is moved in anendwise direction to withdraw the lock bolt it maintains its engagementwith the two racks 26 and 32 connected respectively to the chuck bodyand counterweight.

It will be understood from what has gone before that as the actuator 24is turned to shift the chuck body laterally the counterweight issimultaneously shifted in the opposite direction for the purpose alreadyeX- plained.

As previously stated, the member 31 is normally not adjusted but when anew series of work pieces of a different size and weight are to bemachined, then and then only will the member 31 be turned to change therelative positions of the two halves of the counterweight to adapt thecounterweight to the new work pieces and to enable it to counterbalancethe off-center weight of the chuck body and work pieces in the differentpositions to which the chuck body and work piece may be moved laterallyto enable the intended machine work to be done.

It is not essential, in order to vary the eifectiveness of thecounterweight, that it be formed in two halves as in the construct-ionof Figs. l to 4, although the latter construction is preferable and hasgreat utility when the work pieces vary in size and weight but whereinthe weight is substantially symmetrical with reference to the center ofthe centrally disposed machined portion of the work piece. If workpieces of substantially the same size and weight but with the weightdistributed unsymmetrically with reference to the center of thecentrally disposed machined portion are to be machined, a differentcounterweight construction and a somewhat different mode of varying theeffectiveness of the counterweight are desirable. In Figs. 5 and6 I haveillustrated a construction which may be employed advantageously underthe conditions last stated, and as here illustrated the counterweight isinrone piece and therefore the whole counterweight is adjusted in onedirection or the other to vary its effectiveness to balance theunsymmetrical portion.

In this construction a one-piece counter'- weight 44 is mounted forsliding movement in the compartment 30 formed between the ribs 30a, asin the iirst construction. This counterweight has attached to it a rack45 arranged as in the first instance with reference to the actuatingpinion 25. The rack is connected to the counterweight by a connectingmember 46 having' a central threaded portion engaging' in a threadedbore of the rack. This connecting member has unthreaded portionsextending through the peripheral portions of the counterweight and it isheld from endwise movement relative to the counterweight by two collars47 which are pinned or otherwise secured to the connecting member andengage inner shoulders of the counterweight, clearly shown in Figs. 5and (l. As in the i'irst construction this connecting member has itsends 46a shaped to accommodate a wrench.

Normally the connecting member 46 is not turned in the use of the chuckand under normal conditions the counterweight is moved simultaneouslywith the movement of the chuck body by the same means as previouslydescribed. However, when the work piece is unsymmertical with referenceto the center of the centrally disposed machined portion, the connectingmember 46 will be turned to adjust the position of the counterweight inits guideway of the chuck body so as to compensate for the unsymmetricalportion of the work piece. The turning of the connecting member 46, ofcourse, moves the counter'- weight as a whole relative to the rack 45,thus causing the counterweight to be brought more closely to one end ofthe rack than to the other. In Fig@ 5 the rack is arranged centrallywith respect to the counte `weight and the turning ofthe connectingmember simply varies this central relationship illustrated by moving thecounterweightin one direction or the other relative to the rack.

lVhen once the position of the counterweight has been adjusted for anunsymmetrical work piece, its position'with reference to the rack 45will remain the same throughout the machining of the work piece, but,obviously, when the chuck body and work piece are moved laterally acrossthe face of the adapter, thus coincidentally shifting the count'erweightthrough the action of the pinion 25 on the rack 45, the counterweightwill have a different counterweighting effect in the latter position ofthe work piece than in its previous position.

As previously stated, this particular Ychuck may be countervveight isemployed when Work pieces are ofaboutthe same Weight but lare unsym,metrical in shape and in the distribution of Weight, Whereas thetwo-part counterweight With its rack and connecting member With anothercounterweight unit. i i Y While I have shown and described the preferredconstruction, I do not Wish to be confined to the precise details orarrangements shovvn but aim in my claims to cover all modificationsWhich do not involve a departure from the spirit and scope of theinvention.

Having thus described my invention,. I claim:

l. A chuck having a a Work holding portion, both movable laterally Withrespect to the aXis of the supporting portion, and means :forsimultaneously shifting the Work holding portion and counteriveight.

2. A chuck having a supporting portion,

supporting portion,

a Work holding portion adiustable laterally With respect to the axis ofthe supporting portion, an adjustable countervveight, and a singleadjusting member for both the Work holding portion and thecounterweight.

3. A chuck comprising a supporting portion, a chuck body adapted toreceive a Work piece, countervveight being both carried by thesupporting portion, and means for simultaneously adjusting them inopposite directions.

4. A chuck comprising a supporting portion, a chuck body for receiving aWork piece mounted to slide laterally on the supporting portion, alocking device for holding the chuck body in predetermined positions,and an actuating member arranged to disengage the locking device fromthe chuck body and to shift the chuck body laterally.

5. A chuck comprising a supporting portion, a chuck body slidablelaterally thereon, a locking device engageable With the chuck body tocenter it in predetermined positions, actuating meansI connected to thelocking device and a counterweight adapted to be shifted oppositely tothe movement of the chuck body. v

6. A chuck comprising a supporting portion, a chuck body slidablelaterally thereon, a locking device engageable With the chuck body tocenter it in predetermined positions, a countervveight adapted to beshifted oppositely to the movement of the chuck body, and a singlemember for actuating the locking device and counterweight.

7 A chuck comprising a supporting portion having a. chuck body and acountera countervveight,

a countervveight, the chuck body and.

Weight movable laterally in v,opposite directions, a lockingdevice forcentering the chuck body in predetermined positions, and a singieactuating member for the `chuck. body, counteryveight and lockingdevice.

8. A chuck comprising jasupporting porf tion having a chuck body and acounter- Weight movable laterally in opposite directions, a locking bodyin predetermined positions, and an actuating member rections andoperatively connected With the locking device, chuck body and counter-Weight.

9. A chuck comprising a supporting portion having a housing, a chuckbodyslidably engaging the front thereof, and a counterweight completelyhoused in the supporting portion and sliiftable laterally therein.V

A l0. A chuck comprising a supporting porf tion adapted to be rotated, achuck body having sliding engagement with the supporting portion, alocking device for centering the chuck body in predetermined positions,actuating means connected to thelocking device,

device for centering the chuck inovable'in tvvo different diandadditional means for clamping the chuck body to the supporting portion`in'any, of said predetermined positions.

l1. A chuck comprising a supporting portion, a laterally movable chuckbody, and a laterally movable countervveiglit, said countervveivht beingcomposed of a pluralityfof members movable as a vunit and relatively.movable laterally With respect to each other.

12. A chuck'comprisingy la supporting portion adapted to be rotated, achuck body slidingly engaging the same, a counterweiglit teriveightbeing composed of members connected together and normally movable as aunit, and ',nieans for changing the relative ,positions ofsaid members.v

13, A chuck comprising a supporting portion adapted to be rotated, achuck body vslidingly engaging said supportingportion,` alcountervveight slidingly carriedby the supporting portion, and meansfor shifting the chuck body kand countervveiglit comprising a rotatablemember, yand rack ,andA pinion conbcth the a lock bolt carried ,A

carried by the supporting portion, said couiiingly'engaging 'saidsupporting portion a counterweight carried by the supporting portion, a`lock bolt for `positioning the chuck body in predetermined positions, almember engaging the lock bolt to shift the latter, and meansoperatively connected with the chuck body and counterweight to shift thecounterweight and arranged also to actuate said member.

16. A chuck comprising a supporting portion adapted to be rotated, achuck body carried by said supporting portion so that it may be movedlaterally of the axis of rotation, and a lock bolt carried by thesupporting portion for positioning the chuck body in predeterminedpositions, said chuck body llia-ving a removable member With sockets ofa predetermined number and spacing adapt` ed to receive the end of thelock bolt.

17. A chuck comprising an adapter designed for connection With arotatable member, a chuck body supported by said adapter and Imovablelaterally thereof, said adapter having a solid peripheral portion andhaving inside said peripheral portion a recessed portion forming aguideway parallel to the direction of movement of `the chuck body, and acounterweight slidingly supported in said guideWay.

18. A chuck body comprising an adapter arranged to be connected to arotary member, a chuck body and a counterweight both carried by theadapter for movement in opposite directions laterally of the axis of roetation, and means for simultaneously shifting the chuck body andcounterweight comprising a shaft having a pinion betweenithecounterweight and chuck body, and a pair of racks both engaging thepinion and one connected With the chuck body and the other with thecounterweight. l

19. A chuck body comprising an adapter designed for connection with arotary meinber, a chuck body and a counterweight mounted for movement inopposite directions laterally of the axis of rotation, means forsimultaneously shifting the chuck body and counterweight comprising ashaft having a pinion between the counterweight and chuck body, a pairof racks both engaging the pinion and one connected With the chuck bodyand the other With the counterweight, and a lock bolt adapted to engagethe chuck body to correctly position the latter, said shaft beingarranged for endWise movement to Withdraw the lock bolt.

20. A chuck body comprising an adapter designed to be connected to arotary member, a chuck body and a counterweight mounted for movement inopposite directions laterally of the axis of rotation, means forsimultaneously shifting the chuck body and counterweight comprising ashaft having a pinion between the counterweight and chuck body, a pairof racks both engaging the pinion and one connected With the chuck bodyand the other With the counteriveight, a lock bolt adapted to engage thechuck body to correctly position the latter, saidV shaft being arrangedto withdraw the lock bolt, and spring means arranged to restore the lockbolt and to shift said shaft to its normal position.

able counterWeight, an actuating member in the form of a pinion forsimultaneously f shifting the chuck body and countervveight in oppositedirections, and a separate actuating member in the form of a screw foradjusting the position of the counterweight relative to the chuck bodyto vary its counterbalancing effectiveness.

In testimony whereof, I hereunto afiix my signature.

JoHN J. N. VAN HAMERsvELD.

